JP3347726B2 - Brake shoe - Google Patents

Description

The present invention relates to a brake shoe according to the preamble of claims 1 or 13 and a cutting tool according to claim 19.

Known brake shoes have a lining support plate and a friction lining, and further have a damper shim located on the side of the lining support plate opposite the friction lining and fixed against displacement and torsion. are doing.

A brake shoe of this kind is known from DE 2713377A. In this brake shoe, the damper shim is glued between the projecting edge portions of the support plate. For this reason, the lining support plate and the damper shim are securely connected. Known damper shims are clamped between edge portions having a preload. This reduces the damping performance.

In the case of a brake shoe for a disc brake, as known from DE-3425406A, the damper shim is fixed to the outer periphery of the lining support plate via a thin plate projecting perpendicularly from the edge.

A brake shoe known from EP-0373333A2 has a damper shim arranged between a retaining spring and a lining support plate. This damper shim is fixed so that displacement and torsion are prevented. In this case, the damper shim is securely held and mated with the lining support plate. For this purpose, the damper shim is provided with a ball-shaped boss which engages a recess in the support plate. The ball-shaped boss has conically extending ball walls which are subject to significant wear at the rotating edge of the recess in the support plate. A further disadvantage is that the friction lining contacts the damper shim via the recess when the damper shim is glued, which may undesirably distort the lining support plate.

SUMMARY OF THE INVENTION It is an object of the invention to optimize the damping shim damping performance of a brake shoe of the type mentioned at the outset, while properly fixing the position of the damping shim.

This object is achieved according to the invention in that the lining support plate and the damper shim have two through cut-outs which are respectively aligned and adapted to one another. Was. The through cutout of the damper shim is provided with a projection projecting toward the lining support plate and extending at least partially around the cutout. These projections also engage with corresponding notches in the lining support plate.
This mating leaves a small amount of play to allow movement of the damper shim. The damper shim bonded to the glued lining support plate by the adhesive coating is aligned by at least two mutually matched notches in the lining support plate and the damper shim. In this case, this alignment is made possible by the bead or projection of the notch of the damper shim, which engages the notch of the lining support plate. By making the damper shim also have a notch, the friction lining pressed against the lining support plate on the damper shim side,
Since the strain is not generated by pressing the damper shim, the damping performance of the damper shim does not decrease.

The movable range of the damper shim within the notch of the lining support plate is set within a narrow predetermined limit. The displacement tolerance of the damper shim can be individually determined for different types of brake shoes.

The notch in the lining support plate is preferably formed so as to be enlarged stepwise toward the damper shim.
By configuring the opening of the notch in a stepped manner, even if excess friction material comes into the notch, the damper shim does not come into contact with the bead or projection of the notch,
The support of the lining material on the damper shim is reliably prevented.

The notch projections of the damper shim surround the entire perimeter of the notch, thereby forming a bead which forms a stop in either direction of the damper shim.

Advantageously, these projections extend at right angles from the damper shim. In this case, the projections engage the notch in a predetermined fit, in other words in the form of a play fit, and there is no risk of the opening of the notch being worn at the edge.

The notch opening in the lining support plate is chamfered at the side of the damper shim.

According to another solution of the object of the invention, as claimed in claim 13, the lining support plate and the damper shim each have at least one mutually aligned through-cut, One or more notches of the damper shim have at least two, in plan view, straight edges which are aligned with a radial axis extending through the axis of symmetry of the lining support plate. Mating which are inclined in opposite directions with respect to each other and whose linear edges have tongues projecting towards the lining support plate, these tongues permit a limited movement of the damper shim. It is adapted to engage a corresponding notch in the lining support plate in a manner.

According to the present invention, the damper shim can be accurately fixed in its position by through-cuts aligned and fitted to each other, and no distortion occurs between the lining support plate and the damper shim. The reason for this is that a limited movement space is left between these notches and the tongues projecting towards the lining support plate and engaging the notches in this plate. The damper shim is reliably prevented from slipping or twisting on the lining support plate, even if a strong shearing or twisting force is generated by vibration during the braking operation.

Fixing the position of the damper shim is particularly advantageous when the brake shoes become hot. This is because, in that case, the adhesive bonding the damper shim to the support plate softens, thereby allowing the damper shim to actually float on the lining support plate and become displaceable. The solution according to the invention according to claims 1 and 13 respectively enables the fixing of the damper shim in spite of the floating arrangement of the damper shim.

An important advantage is that the tongue protruding downward is less likely to break.

The notch of the lining support plate is preferably circular. Circular cutouts can easily be made technically.

The notches in the damper shim each have two parallel straight edges. This rectangular cutout can be formed in a single machining step with a simple gable roof tool.

The notches in the damper shim preferably converge radially with respect to each other. By forming the notch in such a geometry, the guidance of the force from the damper shim to the lining support plate becomes more favorable under load conditions. The optimum angle of inclination of the notch depends on the type of brake and is therefore variable.

A tool for forming a cutout in a damper shim according to claim 13 is preferably used for bending the tongue to the final position of the assembly step. As a result, a separate tool for bending the tongue is not required, and thus no additional manufacturing steps are required. In particular, the notch of the damper shim required for fixing the position is manufactured not by punching but by a combination of cutting and bending processes. By manufacturing in this manner, no finishing step is required.

In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a view of a brake shoe having a damper shim adhered thereon, FIG. 2 is a cross-sectional view taken along line − of FIG. 1, FIG. 3 is a view of a lining support plate, and FIG. 5 is a partial sectional view of a cut-out area of the damper shim, FIG. 6 is a sectional view of an embodiment having a conical cut-out in the lining support plate, FIG. 7 is another implementation of the damper shim. FIG. 8 is a view of a damper shim having a cut-out notch for fixing the position, FIG. 9 is a perspective view of a cutting tool, and FIG. 10 shows a contour of a punched portion of the damper shim and a notch cut at the same time. Fig. 11, Fig. 11 is a cross-sectional view showing the form of connection between the damper shim and the lining support plate, Fig. 12 shows the position of the tongue in the notch of the lining support plate, and Fig. 13 shows another embodiment of the damper shim. It is the figure which showed the aspect.

The brake shoe shown in FIG. 1 comprises a lining support plate 1 having a lining 2 on one side and a damper shim 3 on the other side opposite to the lining 2. The damper shim 3 is preferably adhered to the lining support plate 1.

The lining support plate 1 and the damper shim 3 of FIG.
It has at least two circular cutouts 5,7 and 6,8, each adapted to one another. The notches 7 and 8 of the damper shim 3 have projections 9 protruding toward the lining support plate 1, and the projections 9 are engaged with the notches 5 and 6 of the plate 1. The notches 7, 8 of the damper shim 3 are concentric with the corresponding notches 5, 6 of the plate 1.

In the embodiment shown in FIG. 2, the lining support plate 1 has a stepped notch 6. The notch portion 12 on the lining 2 side has a smaller diameter than the notch portion 10 on the damper shim side. Furthermore, the lining side cut-out part 12 is configured to be somewhat conical, so that the opening of the lining side notch part 12 is narrowed in the direction of the damper shim 3.
The bent projection 9 of the damper shim 3 engages the enlarged cut-out 12. Since the outer diameter of the projection 9 is smaller than the inner diameter of the notch portion 10 on the damper shim side by a predetermined dimension, it is sufficiently fixed in the notches 5 and 6 of the plate 1, but is limited by a predetermined play. In addition, movement in two axial directions is possible. Accordingly, the position of the damper shim 3 is fixed sufficiently accurately and rigidly, but the damping performance is not reduced by the extremely secure shape-fitting connection. As a result, vibration damping is improved.

What is important in this sense is that when the brake lining 2 is pressed against the support plate, the lining 2 penetrates to various extents into the cutouts 5, 6 without contacting the damper shim 3. Since there is no contact, the damping performance does not decrease.

FIG. 3 shows a lining support plate 1 having notches 5,6. Circular cutouts 5, 6, 7, 8 are particularly preferred, but the principle of inserting the damper shim 3 into the cutouts of the plate 1 in a predetermined fitting manner can be applied to other cutout shapes.

Furthermore, the notches 5, 6 of the plate 1 have no steps, but have walls extending at right angles to the surface of the plate 1.

In another embodiment without stepped cutouts 5,6, the walls of the cutouts 5,6 extend conically towards the damper shim 3. As a result, even if the lining material 2 enters the notch, it does not come into contact with the damper shim 3.

As can be seen from the embodiment of FIG. 4, the notch portion 10 on the damper shim side has a chamfered edge, so that the wear of the damper shim 3 can be better prevented.

As can be seen from FIG. 5, the projections 9 of the damper shim 3 advantageously project at right angles from the damper shim, so that even if the damper shim side cutouts of the cutouts 5, 6 are not chamfered, the wear of the damper shim is reduced. Well prevented.

It is also important that the projections 9 do not contact the walls of the notches 5 and 6 and are separated from the walls by, for example, about 0.2 to 0.5 mm.

In the case of the stepped notches 5 and 6 of the plate 1, the projection 9 is located at a sufficient distance from the step portion, so that even when an axial force is applied, the projection of the damper shim remains in the axial direction. There is no contact with the plate 1.

The notches 5, 6, 7, and 8 can also have a polygonal outer shape, and can also serve as rotation preventing means at the same time. In this case, it is sufficient to provide one notch in each of the damper shim 3 and the plate 1.

FIG. 7 shows another embodiment of a damper shim 3 having notches 7, 8 of special design. The notches 7 and 8 consist of a substantially circular hole 14 punched out, this hole 14
Has 16 The tongue 16 is 90 in this embodiment.
角 angular distance. Therefore, the two tongues
They face each other in the notches 7 and 8. The tongue 16 is
It is bent by 90 ° with respect to the surface of the damper shim 3,
It is inserted into the circular or polygonal cutouts 5 and 6 of the plate 1. In the embodiment of FIG. 7, the projection 9 comprises a rectangular flat tongue 16.

FIG. 8 shows a damper shim 3 for a brake shoe comprising a lining support plate 1 and a friction lining 2. This damper shim is preferably adhered to the surface of the plate 1 opposite to the lining 2.

The plate 1 and the damper shim 3 have notches 5,7 and notches 6,8 aligned with one another, respectively. The notches 7, 8 of the damper shim 3 have tongues 16 projecting toward the plate 1 in the form of projections. The tongue 16 engages the circular cutouts 5, 6 of the plate 1.

The notches 7, 8 in Dampa Sim 3 are virtually rectangular,
The short side does not have a tongue, and the long side has a tongue forming a linear edge 15 in a plan view.
A tongue 16 protruding to the side is provided.

The notches 7, 8 are inclined relative to one another by a small angle with respect to the radial axis 18 of the disc brake belonging to the brake shoe. Radial axis 18 extends through the axis of symmetry of the brake shoe. Thereby, the notch converges slightly outward in the radial direction.

The arrangement of the notches 7, 8 in FIG. 8, ie the arrangement of the two notches at angles α, β with respect to the radial axis 18, fixes the damper shim in the radial direction of the disc brake. Suitable for

Advantageously, the angle of inclination relative to the radial axis 18 is zero.
The range is {5}, and is set for each vehicle and each type of brake. The angle chosen is determined by the following parameters: lining dimensions, lining stiffness, friction conditions, friction force.

The tongues 16 of the cutouts 7,8 are movable within tolerances for the cutouts 5,6. As a result, the narrow lateral end face 17 of the tongue 16
Does not come into contact with the notches 5 and 6 in a state where the acting force is released. Thereby, the damping performance of the damper shim is not impaired.

Under load, the tongues 16 in the notches 5 and 6
Since the point contact occurs, the force is smoothly guided to the plate 1 and the slip of the damper shim 3 on the plate 1 is reliably prevented.

The position of the damper shim 3 is therefore fixed with sufficient accuracy and fixing. The damping performance is not compromised by a secure or form-fit connection. As a result, vibration damping is improved.

As can be seen from FIG. 11, the friction lining 2 does not come into contact with the tongue 16 even when the damper shim enters the notches 5 and 6 of the plate 1, so that the damper shim 3
Does not deteriorate.

FIG. 10 shows a manufacturing stage in which the damper shim 3 is manufactured by the punching tool 22. The outer shape of the damper shim 3 is determined by the punching tool 22, and the cutting tool 20 cuts the notches 7, 8 of the damper shim 3 without performing punching. FIG. 9 shows a cutting tool 20 with a cutting blade in a hatched view. The cutting blade resembles an inverted gable roof. The cutting tool has a main cutting line at the center of the straight edge 15 and a cutting line extending at right angles to the cutting line and a side edge of the cutting tool 20, and further,
An H-shaped cut is formed having short sides of the substantially rectangular cutouts 7,8 and cut lines intersecting without forming a tongue 16.

Due to the special design of the cutting tool 20, the two tongues 16 are simultaneously formed as H-shaped cuts during the cutting process and are bent by moving the tool 20 further deeper. As a result, two working steps, namely, punching and bending steps, can be achieved by a single cutting tool 20 in a single cutting step.

After withdrawal of the cutting tool 20, the tongues will spring slightly, so that the desired play is left between the tongues 16 and the walls of the notches 5, 6, while at the same time the damper shim 3 The optimal position of is maintained.

In the embodiment of FIG. 13, for example, only one isosceles or an equilateral triangular notch is provided. in this case,
In the case of an equilateral triangular notch, only isometric legs have tongues 16
Or, it has a straight edge 15.

In particular, when the notches 5 and 6 have the tongues 16 engaging in a triangular shape in an equilateral relationship, the symmetrical axis passing through the vertices of the tongues 16 forming the triangle has the notches 7 and 8 When arranged symmetrically with respect to the radial axis 18, it is inclined with respect to the radial axis 18 by angles α, β.

The damper shim 3 can additionally have a rubber coating on one or both sides, in particular for damping vibrations transmitted by the braking piston.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-207535 (JP, A) JP-A-64-49634 (JP, A) JP-A-63-235736 (JP, A) 180027 (JP, U) Japanese Utility Model 62-87223 (JP, U) Japanese Utility Model 4-1747 (JP, U) Japanese Utility Model 60-2027 (JP, U) Japanese Utility Model Utility Model 55-68732 (JP, U) Special Table Hei 6-504604 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 49/00-71/04

Claims (18)

(57) [Claims] 1. A lining support plate (1) and a friction lining (2), and a shear force on a side of the lining support plate (1) opposite to the friction lining (2). In the brake shoe to which the damper shim (3) is attached, the lining support plate (1) and the damper shim (3) are aligned with each other and are fitted with the through notches (5, 6, 7, 8). The notches (7, 8) of the damper shim (3) have projections (9) projecting toward the lining support plate (1), and these projections (9) are It extends over at least a part of the notch and engages with the corresponding notch (5, 6) of the lining support plate (1) in a play-fit manner which allows limited movement of the damper shim (3). Characteristic Brake shoes to be. 2. The notch (5, 6) is formed stepwise in the lining support plate (1) and has an enlarged notch (10) on the damper shim (3) side. The brake shoe according to claim 1, characterized in that: 3. The brake shoe according to claim 2, wherein the notch (12) on the side of the lining (2) tapers conically toward the damper shim (3). 4. The lining support plate according to claim 1, wherein the notches in the lining support plate are tapered conically toward the damper shim. Brake shoe. 5. The brake shoe according to claim 1, wherein the projection extends over the entire circumference of the notch. 6. The damper shim (3) extends at right angles from said damper shim (3).
The brake shoe according to any one of the above. 7. The brake shoe according to claim 1, wherein the notch of the lining support plate (1) is chamfered on the side of the damper shim (3). . 8. The damper shim (3) is adhered to the lining support plate (1).
The brake shoe according to any one of claims 1 to 7. 9. The brake shoe according to claim 1, wherein the notch has a polygonal outer shape. 10. The lining support plate (1) and the damper shim (3) each have at least two circular
9. The brake shoe according to claim 1, wherein the brake shoe has two notches. 8. 11. The projection (9) comprises a plurality of tongues (16) having equal angular distances from each other, wherein the tongues comprise:
It protrudes from a punched circular hole (14) of each notch (7, 8) and is engaged with a circular or polygonal notch (5, 6) of said lining support plate (1). The brake shoe according to any one of claims 1 to 8, wherein 12. The brake shoe according to claim 11, wherein said tongue has a rectangular shape. 13. A brake shoe for a disc brake, comprising: a lining support plate (1) symmetrical with respect to a plane of the disc brake that is parallel and orthogonal to a rotation axis of the disc brake; and a friction lining (2). A damper shim (3) arranged to resist shear forces on the side of the lining support plate (1) opposite to the friction lining (2); The support plate (1) and the damper shim (3) each have at least one through cutout (5, 6, 7, 8) aligned with one another, and one or more of the damper shims (3) Multiple notches (7,8)
Has at least two straight edges (15), said straight edges (15) extending through a symmetry axis of said lining support plate (1).
8) extending obliquely in the opposite direction to said straight edge (15) having a tongue (16) projecting towards said lining support plate (1), said tongue being (16) in the form of a play spring which allows a limited movement of the damper shim (3) in a direction parallel to the edge (15) and a corresponding notch (5, 6) of the lining support plate (1). A brake shoe for a disc brake, which is engaged. 14. The brake shoe according to claim 13, wherein the straight edge (15) is parallel or at an angle of less than 5 ° to the radial axis (18). 15. The method as claimed in claim 13, wherein the notch has a straight edge with a tongue, each of which is parallel to one another. A brake shoe according to any one of the preceding claims. 16. Notches (7, 8) of said damper shim (3).
Brake shoe according to one of the claims 13 to 15, characterized in that the straight edges (15) of the two converge radially outwardly. 17. The notch (7, 8) has three straight edges (15), the tongues (16) of these edges being associated with the notch (5, 6) in a triangular shape. Characterized by
14. The brake shoe according to claim 13. 18. The notch (5, 6) of the lining support plate (1) is circular and the tongue (16)
18. The brake according to claim 13, wherein a play for displacement is provided between a side end (17) of the vehicle and the lining support plate (1). Shoe.